I feel pain in my back when I breath in, is it serious?

a few days ago I was eating very fast and drinking some water. I took a bite of rice and partially swallowed it before I chugged some water. ever since then i've felt pain in my back while inhaling, it's about mid back a few inches to the left of my spine. only on the left side though. it's a sharp pain that I only feel when I inhale. stretching doesn't bother me. any idea what this is?